Double roller for balance-escapements.



No. 7 0,179. PATENTED SEPT. 29; 1903.

F. J. REAVES. DOUBLE ROLLER FOR BALANCE ESGAPEMENTS.

APPLICATION IILBD AUG. 23, 1902.

K0 MODEL.

lllllillll UNITED STATES I Patented September 29, 1903.

PATENT OFFICE.

FRANK J. REAVES, ROCKFORD, ILLINOIS, ASSIGNOR TO THE ROCKFORD WATCHCOMPANY, LIMITED, A CORPORATION OF ILLINOIS.

DOUBLE ROLLER FOR BALANCE-ESCAPEMENTS.

SPECIFICATION forming part of Letters Patent No. 740,179, datedSeptember 29, 1903.

Application filed August 23, 1902. Serial No. 120,735. (No model.)

To aZZ whom it may concern:

Be it known that I, FRANK J. RE AVES, a citizen of the United States,residing at Rockford, in the county of Winnebago and State 5 ofIllinois, have invented certain new and useful Improvements in DoubleRollers for Watch-Escapements, of which the following is aspecification.

This invention relates to that class of mechanisms known as theescapement of watches, and particularly to a double roller to be used inconnection therewith, all of which will more fully hereinafter appear,

The principal object of this invention is to provide a simple,economical, and efficient double roller for watch-escapements, made intwo parts and arranged to be detachably secured together, so that it maybe separated easily and always assembled in correct relation.

Further objects of the invention will appear from an examination of thedrawings and the following description and claims.

The invention consists principally in a double roller forwatch-escapements, made in two parts detachably secured together, andmeans for assisting in the assembled relation of such parts to hold themin correct relation.

The invention consists, further and finally, in the features,combinations, and details of construction hereinafter described andclaimed.

In the accompanying drawings, Figure 1 is a plan view of an escapementhaving a double roller constructed in accordance with theseimprovements; Fig. 2, a side elevation of the same; Fig. 3, an enlargedsectional elevation taken on line 3 of Fig. 1, illustrating a rollerconstructed in accordance with these improvements; Fig. 4, a plan viewof the lower flange on the roller proper looking at it from below, andFig. 5 a plan view of the main or lower portion of the roller looking atit from above.

In the art to which this invention relates it is well known that adouble roller is very advantageous in that better adjustments of timecan be made, owing to the fact that the roller-jewel can be located atthe maximum distance from the axis of the balance-staff.

It therefore becomes desirable to make a doufurther or detaileddescription here.

ble roller which will have this advantage and the additional one ofbeing easilyseparated for purposes of repair, renewal, and adjustment,all of which will be understood and appreciated by those skilled in theart.

In making a roller in accordance with these improvements I provide amain or lower portion at, having an upwardly-extending rollerjewel I)located therein at its maximum distance from the axis of thestaff-opening c in such roller. This main or lower portion is alsoprovided with a circular recess (1 in the upper face thereof, having adowel-pin hole e extending therethrough. I next provide a roller portionproper,f, having a passing hollow Q therein arranged opposite therollerjewel, and an integral downwardly-extending tubular portion 71,provided with a circular flange t' at the bottom thereof. This circularflanged portion is of a size to snugly fit the upper recess (1 in thelower portion of the roller and is further provided with a dowelpin 70,arranged to fit the dowel-pin hole in such recess.

In operation the roller is placed on the balance-staff t and the usualpallet Z and fork m are supplied, operating with the rest of theescapement and watch-train, all of which is old and well known in theart and needs no The fork has the slot and horn portions n at the frontportion engaging with the roller-jewel and is further provided with adart p, arranged when the parts are in the position shown in Fig. 1 torest in the passing hollow and at other times on the periphery of theroller proper until such roller rotates backward and releases the same,all of which is well known and understood by those skilled in the art.

The roller or different parts thereof may be placed together and broughtinto correct relation without any fitting or may be sepa* rated for thepurposes of repair, renewal, or adjustment with the assurance that theycan be reassembled in the correct relation.

I claim-*- 1. In a double roller escapement for watches, a balancestafi, a double roller formed in two parts detachably secured together,and means for assisting in the assem bled relation of such parts toholdthem in correct relation, substantially as described.

2. In a double roller escapement for watches, a balance staff, a doubleroller formed of a main portion carrying a rollerjewel, a supplementarydisk portion provided with a passing hollow, a tubular portiondetachably connecting both of such portions, and means for holding suchportions in correct relation, substantially as described.

3. In a double roller escapement for Watches, a balance-staif, thecombination of a main portion provided with a roller-jewel extendingupwardly therethrough, a disk portion of smaller diameter provided witha passing hollow, an integral tubular portion extending downwardlytherefrom having a flange in its lower portion, and means for holdingsuch parts in correct relation, substantially as described.

4. In a double roller escapement for watches, a balance staif, a doubleroller formed of a main portion carrying an upwardly-extendingroller-jewel and a circular recess in its upper portion, a disk rollerof smaller diameter provided with a passing hollow and an integraltubular portion extending downwardly therefrom and having a circularflange at its lower end fitting the circular recess in the main portion,and dowelpin mechanism for holding such parts in their correct relation,substantially as described.

FRANK J. REAVES.

Witnesses:

H. I. CROMER, A. L. SAVOIE.

